单词	preumbonal
释义	preumbonal adjective pre·​umbonal ¦prē+ : situated before the umbones of a bivalve shell Word History Etymology pre- + umbonal
随便看	Rizzio rizzom RJ Rjukan rkt RKVA rky RL RL and R RLO rly rm RMI rms rmt Rn RNA RNA interference RNA polymerase RNA virus rnaase rnaases RNAi rnas RNase

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